Forced conveying type electric reboiling furnace for materials at bottom of distillation tower
By using a forced-feed electric reboiler, electric heating tubes and an electric control system are used to replace gas-fired heating furnaces, solving the problems of high energy consumption, high pollution, and safety hazards associated with gas-fired heating furnaces, and achieving efficient, safe, and intelligent heating control.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-01
- Publication Date
- 2026-03-17
AI Technical Summary
Existing petrochemical plants mostly use gas-fired reboiler furnaces at the bottom of the tower, which have problems such as high fuel consumption, large carbon emissions, large pollutant emissions, large equipment footprint, and safety hazards from gas leaks.
A forced conveying electric reboiler is adopted, which uses electric heating tubes to heat the material at the bottom of the distillation column. Safe and reliable heating control is achieved through an explosion-proof junction box and an electrical control system. External insulation reduces heat loss, and the medium flows back and forth under the action of baffles to improve heat transfer efficiency. Multiple heating furnaces are connected in series or in parallel to meet high load requirements.
It achieves clean and environmentally friendly operation, high safety, high level of intelligence, convenient adjustment, rapid start-up and thermal efficiency of up to 98%, with no combustion exhaust gas or gas leakage hazards, meeting the requirements of high temperature control.
Smart Images
Figure CN223995406U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of petrochemical heating furnace technology, and to a forced conveying electric reboiler for materials at the bottom of distillation towers, which is suitable for heating various bottom materials in oil refining, chemical and other fields. Background Technology
[0002] Existing petrochemical plants mostly use gas-fired reboiler furnaces at the bottom of towers, which result in high fuel consumption, large carbon emissions, and emissions of pollutants such as nitrogen oxides, leading to low environmental protection standards and high energy consumption. Gas-fired furnaces require a supporting fuel supply system, occupy a large area, and pose a safety hazard of gas leaks.
[0003] This invention relates to a forced conveying electric reboiler for materials at the bottom of a distillation tower, which can completely replace fuel oil or gas reboiler heaters in the petrochemical industry. Utility Model Content
[0004] To solve the above problems, this utility model provides a forced conveying electric reboiler for the bottom material of a distillation column. The liquid material at the bottom of the distillation column flows out from the bottom of the column, is pressurized by a pump, and then enters the electric reboiler for heating. The heated medium is generally in the gas phase, and the heated gas medium flows out from the top of the electric reboiler.
[0005] The technical solution adopted in this utility model is as follows:
[0006] A forced-feed electric reboiler for materials at the bottom of a distillation column includes an explosion-proof junction box 1, an electric heating tube 2, a flange cover 3, a flange 4, and a baffle plate 7, with each component connected sequentially. The electric heating tube 2 extends into the housing 5 through the flange cover 3 and the flange 4. The portion of the electric heating tube 2 inside the housing 5 is equipped with the baffle plate 7. A temperature sensing element 6 is installed inside the housing 5 to measure the tube wall temperature. An over-temperature interlock protection system stops heating when the temperature exceeds the coking temperature of the oil. The inner core of the electric heating tube 2 is a heating resistance wire, and the outer tube is made of high-alloy steel or a suitable material selected according to the characteristics of the heating medium. Magnesium oxide powder is used for insulation between the heating resistance wire and the outer tube.
[0007] The shell 5 is provided with an oil outlet 8, an oil inlet 12, a sliding support 10, a fixed support 11, and a head 9;
[0008] Thermocouples are installed at oil export point 8 and oil import point 12. The heating element power is adjusted in real time based on the inlet and outlet temperatures to achieve precise temperature control.
[0009] The purpose of heating the medium.
[0010] The explosion-proof junction box 1 is equipped with a control inlet 13 and a power inlet 14. The explosion-proof level of the junction box can reach DIICT4 according to the usage requirements, which is suitable for the high explosion-proof requirements of the petrochemical industry. The protection level can reach IP65 and above.
[0011] The control inlet 13 and the power inlet 14 are respectively connected to the electrical control system 16. After power is supplied, the electric heating tube 2 heats up. The electrical control system 16 receives signals from instruments such as temperature and pressure.
[0012] External insulation 15 is for forced conveying electric reboiler furnace external insulation to reduce heat loss.
[0013] The medium enters through the oil inlet 12 and exchanges heat with the electric heating tube 2 inside the shell 5. Under the action of the baffle 7, the medium flows back and forth. If necessary, a bypass baffle or bypass pipe can be added inside the shell.
[0014] For electric reboiler furnaces with forced pump delivery, the outer diameter of the shell can be designed to be smaller, and the spacing between baffles can be smaller to achieve higher flow velocities and thus higher heat transfer coefficients. The heated medium flows out through oil outlet 8.
[0015] The electric heating furnace can be vertical or horizontal. For heating media with high load requirements, multiple forced conveying electric reboiler furnaces can be connected in series or parallel to obtain high power. Theoretically, the power of this electric heating furnace can range from 0 to infinity.
[0016] This utility model has the following advantages.
[0017] (1) Clean and environmentally friendly: It does not produce combustion exhaust gas or any pollutants.
[0018] (2) High safety: The equipment is equipped with various safety protection devices, and has a high safety factor. There are no safety hazards such as gas leakage or explosion.
[0019] (3) High level of intelligence: It is easy to realize automated control and remote operation, reducing manual intervention. Precise temperature control is achieved by adopting a more accurate temperature control method to meet the process requirements with high temperature control requirements.
[0020] (4) Easy to adjust: The temperature can be adjusted by adjusting the power of the heating module, which can meet the needs of large changes in operation.
[0021] (5) Quick start: It can start up quickly and reach the working temperature without the need for a complicated ignition and preheating process like a gas heater.
[0022] (6) Simple system: There are no complex components related to the combustion system, the maintenance cost is low and the maintenance work is relatively simple.
[0023] (7) The heating furnace of this utility model has only one heat loss, and the thermal efficiency can reach 98%, which is much greater than that of traditional gas heating furnaces. Attached Figure Description
[0024] Figure 1This is a flowchart illustrating the process of this utility model;
[0025] Figure 2 This is a cross-sectional view of the present invention;
[0026] Figure 3 This is a schematic diagram of the horizontal series connection of this utility model;
[0027] In the diagram: 1. Explosion-proof junction box; 2. Electric heating tube; 3. Flange cover; 4. Flange; 5. Housing; 6. Temperature sensing element; 7. Baffle plate; 8. Oil outlet; 9. End cap; 10. Sliding support; 11. Fixed support; 12. Oil inlet; 13. Control inlet; 14. Power inlet; 15. External insulation; 16. Electrical control system; 17. Distillation tower; 18. Pump. Detailed Implementation
[0028] The specific embodiments of this utility model will be further described below with reference to the technical solution and accompanying drawings.
[0029] The control inlet 13 and power inlet 14 are connected to the electrical control system to supply heat to the electric heating tube and receive signals from instruments such as temperature and pressure gauges. Electricity is supplied through the explosion-proof junction box 1, and the electric heating tube 2 heats up after being energized. The medium enters through inlet 12 and exchanges heat with the electric heating tube 2 inside the housing 5. Under the action of the baffle 7, the medium flows back and forth. A bypass baffle or bypass pipe can be added inside the housing as needed. The heated medium flows out through outlet 8. A thermocouple is installed at the medium outlet to adjust the power of the heating tube in real time according to the outlet temperature. A temperature sensing element 6 is installed to measure the tube wall temperature of the electric heating tube to prevent the medium from coking.
Claims
1. A forced carryover electric reboiler for distillation column kettle bottoms, characterized by, It comprises an explosion-proof terminal box (1), an electric heating tube (2), a flange cover (3), a flange (4) and a baffle (7), and the components are sequentially connected; the electric heating tube (2) extends into the inside of a shell (5) through the flange cover (3) and the flange (4); the electric heating tube (2) in the inside of the shell (5) is provided with the baffle (7); a temperature measuring element (6) is arranged in the inside of the shell (5) and can measure the temperature of the tube wall of the electric heating tube; when the temperature exceeds the coking temperature of oil, the heating is stopped through an over-temperature interlocking protection system; the inner core of the electric heating tube (2) is a heating resistance wire, the outer sleeve is made of high alloy steel or a suitable material selected according to the characteristics of the heating medium, and magnesium oxide powder is filled between the heating resistance wire and the outer sleeve for insulation.
2. A forced carryover electric reboiler for distillation column kettle bottoms as defined in claim 1, wherein, The shell (5) is provided with an oil outlet (8), an oil inlet (12), a sliding support (10), a fixed support (11) and a head (9); the oil outlet (8) and the oil inlet (12) are provided with thermocouples, the power of the heating tube is adjusted according to the temperature of the outlet and the inlet, and the purpose of accurately heating the medium is achieved.
3. A forced carryover electric reboiler for distillation column kettle bottoms as defined in claim 1 wherein, The explosion-proof terminal box (1) is provided with a control inlet (13) and a power inlet (14), and the explosion-proof terminal box can reach the explosion-proof level of DIICT4 according to the use requirements, is suitable for the high explosion-proof requirements of the petrochemical industry, and can reach the protection level of IP65 and above.
4. A forced carryover electric reboiler for distillation column kettle contents as defined in claim 1 wherein, The control inlet (13) and the power inlet (14) are connected with an electric control system (16), and the electric heating tube (2) generates heat after power supply; the electric control system (16) receives signals of temperature and pressure meters.
5. A forced carryover electric reboiler for distillation column kettle contents as defined in claim 1 wherein, The outer insulation (15) is a forced conveying type electric reboiler outer insulation, which reduces heat loss.
6. A forced carryover electric reboiler for distillation column kettle contents as defined in claim 1 wherein, The medium enters through the oil inlet (12), exchanges heat with the electric heating tube (2) in the shell (5), and is folded back and forth under the action of the baffle (7), and bypass baffles or bypass pipes can be added in the shell when needed.
7. A forced carryover electric reboiler for distillation column kettle contents as defined in claim 1 wherein, For the electric reboiler shell with forced conveying of the pump, the shell diameter is designed to be smaller, and the baffle spacing is smaller, so as to obtain higher flow rate and higher heat transfer coefficient; the heated medium flows out through the oil outlet (8).
8. A forced carryover electric reboiler for distillation column kettle contents as defined in claim 1 wherein, The electric heating furnace is vertical or horizontal, and for the heating medium with high load demand, multiple forced conveying type electric reboilers are connected in series or parallel to obtain high power.